Machine for forming pipe-cores.



No. 814,028. PATENTED MAR. 6, 1906. F. D. DIMMIGK & A. M. FORD. MACHINEFOR FORMING PIPE OORES.

QPLIOATION FILED AUG. 2, 1904. W Q a SHEETS-SHEET 1.

WITNESSES L dMWIEZIZK/a PATENTED MAR. 6, 1906.

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APPLICATION FILED AUG. 2, 1904.

P D DIMMIGK& A M PO MACHINE FOR FORMING PIPE INVENTORS TNAQY \QQBWW QM(mil Rlbext \Fowck ATTORNEY.

IINITEI) PATENT OFFICE.

FREDERICK D. DIMMIOK AND ALBERT M. FORD, OF BIRMINGHAM,

ALABAMA.

Specification of Letters Patent,

Eatented March 6, 1906.

Application filedAugnst 2, 1904;. Serial No. 219,189.

To Cb whom't't mag concern.-

Be it known that we, FREDERICK D. DIM- MICK and ALBERT M, FORD, citizensof the United States, and residents of the city of Birmingham, State ofAlabama, have invented certain new and useful Improvements in Machinesfor Forming Pipe-Cores, of which the following is a full, clear, andcomplete disclosure.

In the making cores for casting iron and steel pipes of comparativelygreat length and large diameter it is necessary to form a core which isnot only light and easy to handle and of great strength, but which alsoshould be of such a construction to allow the core to be removed fromthe casting after the same has been formed. Cores of this nature aremade in the following manner: first, by winding about a suitablefoundation, known as a core-barrel, a covering or layer of hay rope, ora rope composed of strands of twisted hay or in some instances-loosehay, which are wound upon the core-barrel in a sufficient number ofturns to form a'considerable thickness of the core. Upon this foundationof hay rope or hay is placed a layer of socalled mud, or a compositionof core-sand or of clay, which is allowed to partially harden or dry,and then a second layer of somewhat finer mud or composition is placedupon the first layer, so as to form a smooth surface for the core. Thecore is covered with a coating of blacking and is then baked or' form ofour invention is particularly to provide means for smoothly andaccurately supplying the layers of mud or core-sand to the surface ofthe hay rope, so that the two layers may be applied in one and thesame'machine without the necessity of adjustment or measurement as .thedifferent layers are applied and which will act also as a templet togive the required shape to the surface of the core. In previous forms ofdevices for accomplishing this result after the core-makers had appliedthe first coat of mud on all of the cores to be made in a single day thecores were put into an oven and dried, after which the cores were readyto have the second coating of mud, which finishes the core applied. Inorder to be sure that the core was sary for the foreman to adjust thecore-board at the beginning of a run of a certain size of cores, afterwhich the different layers of mud may be applied without furtheradjustment until the end of the run of cores of that size. Briefly, ourinvention comprises a frame for supporting a hollow iron cylinder 8,

known as the core-barrel, and a pivoted table or core-board which isprovided with edges which have a definite axial relation to each other,so that when said core-board is revolved upon its pivots or trunnionssaid edgeswill correspond, respectively, to the surface of the layers ofthe mud or core-sand which is supplied to the hay-rope foundation of thecore.

Our invention also comprises certain arrangements and construction ofparts hereinafter to be more clearly described, and pointed out in theaccompanying claims.

For afull, clear, and exact description of our invention reference maybe had to the following specification and to the accompanying drawings,forming a part thereof, in which Figure 1 is a plan View of our improvedmachine Fig. 2, a side elevation thereof; Fig. 3, a transverse sectionalviewgFig. 4, a front elevation; Figs. 5 and 6, detailed views of theadjusting means for the edge of the coreboard; Fig. 7, a transversesectional view of one end of the machine, taken on a vertical planepassing through the edges of the coreboard and its trunnions.

Referring to the drawings, the numeral 1 indicates two side frames orsupports, which are preferably composed of a vertical transverse web 2and a web 3 at right angles thereto, at the top of which is supported abracket 4, which is adapted to support a hand,-wheel and shaft,hereinafter to be described. The forward portion of the webbing 2carries a pair of V-shapedways 5, which approach each other at an angleand are adapted to receive a correspondingly-shaped bearing-block 6. Theblock 6 is provided with semicylindrical bearing-seats 7, which areadapted to receive the spindle or shaft 8 of the core carrier or barrel8 for the core 9.

The upper edge of the webbing 2, which v forms the support 1, isprovided with horizontal webs or tables 10, upon which are adapted torest adjustable bearings or pillowblocks 11. The bearings 11 are adaptedto receive the trunnions 12, which extend from the axis of the coreboard or table 13.

In order to get the correct and accurate adjustment of the bearings 11,-so as to bring the edges of the core-board 13 nearer or farther awayfrom the axis of the core 9 which is to be formed, we provide slots 14in the web 10, into which are adapted to extend lugs 15, carried by thebase of the bearingblocks 11. The outside of the casingof the bearing-blocks 11 have an extension 16, through which is a screw-threadedopening The screw-threaded opening 17 is adapted to receive ascrew-threaded shaft 18, which passes through the upper end of thebracket 4 and carries at its outer extremity a handwheel of the usualform, as indicated at 19. Bolts 20 also pass through the base of thebearing-blocks 11 and the slot 14 and engage with the under surface ofthe web 10. These bolts are adapted to hold the bearing-blocks inposition after the same have been adjusted.

To obviate the use of a measure or rule, we provide the edges of-thetables 10 with scales or indicators 21, which are adapted to cooperatewith small pointers 22, carried by the base of the bearing-blocks 11. Bythis arrangement it will be seen that when the handwheels 19 are turnedin one direction or the other the bearing-blocks 11 will be adjusted toand from the axis of the core 9 and the position therefore of theoperative edge of the core-board or table 13 may be accuratelydetermined without other measurements.

As means to hold the table or core-board in a horizontal position whileoperating in connection with the core being formed we provide a pivotedarm 23, which is carried by an adjustable stud 24, located in a slot 25in the web 2 of the machine. The arm 23 is connected with asubstantially horizontally extending arm 26, which carries acounterbalance-weight 27. The upper end of the arm 23 is provided with anotch (indicated at 28) which is adapted to fit over and engage one edgeof the table, as indicated at 29. Beneath the notched portion of the arm23 is a curved projection or arm 30, which is designed to engage theunder side of the table or coreboard 13 to act as a stop, andtherebyhold the table or core-board 13 at any desired angle ofinclination when the edges thereof are not in contact with or operatingupon the core be-- ing formed. This arrangement also allows the table 13to be easily reversed, so that different edges thereof may be broughtinto operative position in relation to the core 9, and also holds thesaid table firmly in position without the danger of the parts becomingdisengaged during the operation.

The details of the core-board or table may be described as follows: Thecore-board 13 is preferably in the form of a cast-iron slab or web whichis integrally connected thereto to the trunnions or bearings 12, beforereferred to. is provided with longitudinal flanges 31, which areplaced'adjacent one edge thereof, which is the edge opposite to thatwhich is employed in shaping the core. One end of each flange is bentslightly inward toward the axis of the core-board, as indicated at 32.This edge of the board corresponds to that which requires less material,owing to the fact that the end of the core which fits into the openingor recess formed by the coreprint is made tapering or frustum-shaped.Both longitudinal edges of the core-board are provided with auxiliarystrips 33, which are adjustably held upon said core board by means ofbolts 34 or other suitable fastening means. The strips 33 are providedwith transverse slots 35, through which the bolts 34 project and whichallow of adjustment in relation to the edges of the core-board 13.

At one end of the core-board we provide other edge pieces 36, which haveinclined outer portions the angle of which corresponds to the angle ofthe inner surface of the recess Each surface of the table or core-boardformed by the core-print when the pipe-mold is formed.

It is sometimes desirable that the different portions of one auxiliaryedge of the coreboard or table be placed at different distances from theaxis of the core shaft or axlethat is, it is desirable at times to bendsaid auxiliary edge away from thesaid axle, thereby varying the shape ofthe core by an increase in diameter at its central portion. For this purose we provide the following means: On eac side of the core-board 13 weprovide a casing 37, which is placed so as to inclose a bolt or screw38, passing through the web or flange 31. These bolts or screws 38 havea screw-threaded portion which engages a nut 39, fixed in relation tothe adjustable edge 33 and preferably attached thereto by the screws 40.The head of the bolt 38 is fixed in position in relation to the web 31by means of a collar or fixed ring 41. It will now be seen that when thebolt-head 38 is turned in one direction the central portion of theadjustable edge 33 will be moved outward,iwhile if or inward curve, saidcurve being accurately maintained during the use of the core-board bymeans of the bolt 34.

The operation of our device may be described as follows: The core-barrel8 having first been wound with the requisite number of turns of hay ropeto give the correct amount of destructible backing for the core, thefirst mixture of core-composition or mud is placed upon one side of thetable or coreboard 13. The core-barrel 8 through the shaft 7 is thenturned by any suitable means, and while said barrel with its foundationof hay rope is revolving the core composition is forced from the edge ofthe core-board, so as to adhere to the revolving cylinder of hay rope.When the said cylinder has reached a size which is limited by theadjustable edge 33 of the core-board, said cylinder will be of therequisite diameter for the first layer of core composition and will beof the required shape, owing to the edge of the core-board acting as atemplet. Said core-barrel and core are then removed from the machine andanother core-barrel having a hay-rope foundation is inserted in itsplace. This is treated in the same manner as the first, and so onsuccessively until a sufficient number of cores have been thus given apreliminary treatment. After the first layer of core foundation hasbecome somewhat hardened or dried the core-board or table 13 is reversedby withdrawing the arm 23, so that the notch 28 will disengage the edgeof said core-board, and so allow the table or board 13 to be revolved.After the table has been revolved into its reversed position the arm 23is then allowed to resume its normal position with the notch 28 engagingthe edge of said core-board. Owing to the fact that one adjustable edgeof the core-board is at a slightly greater distance from the axis of thecorebarrel 8 there will be a space between the surface of the core, asfirst formed, and the edge just brought into position Mud is thenapplied to the surface of the core in the same manner as in the firstinstance until the surface of said core is accurately formed by thesecond edge 33. While the core 9 is still revolving the lever 23 ismoved from its normal position, so that the notch 28 is disengaged fromthe edge of the table 13, thereby allowing the table to tip so that theedge adjacent the core will move upward, which will remove the surplusmud which would still have a tendency to adhere to the core 9. The edge33 of the table 13 is then cleaned, and said table is then allowed toresume its normal horizontal position, and while the core is still beingrevolved a thin coating of blacking is applied to its surface. The table13 is then tilted upward in thesame manner as before, which similarlyremoves the surplus blacking, leaving the core 9 symmetrical and with asmooth finished surface. The

core 9 may be now lifted from its bearings 7 and placed in a suitableplace to dry. This gives a core of the requisite surface, diameter, andshape, and after drying the same is ready for use in connection with thepipe-mold. It is obvious that for cores for pipes of small diameter thehay or hay rope may be Wound directly on the shaft or axle 7.

It will be noticed that one of the advantages of this machine is that alarge number of pipe-cores may be treated at the same time, with theassurance that each one will be of the same diameter and shape, and eachwill have its surface accurately true. Another advantage of this mannerof forming pipe-cores resides in the fact that the layers applied to thehay-rope foundation are of uniform thickness, and therefore subject tothe same amount of contraction in drying or hardening and with lessliability of crackin Having thus described our invention, 1t will beapparent that changes may be made in the form and proportion andarrangement of parts, and the use of mechanical equivalents may beemployed therein without departing from the spirit and scope of ourinvention; but

What we claim, and desire to protect by Letters Patent of the UnitedStates, is

1. In an apparatus for forming pipe-cores, the combination of acore-carrier and a reversible core-board pivoted adjacent saidcorecarrier so that each longitudinal edge thereof will form a guide inthe turning or forming of said core.

2. In an apparatus for forming pipe cOreS, the combination of acore-carrier and a reversible coreboard pivoted on an axis parallel tosaid carrier and adapted to hold the material to be applied to saidcore, and also to form a templet in the turning or forming of said core.

3. In an apparatus for forming pipe-cores, the combination of means forsupporting a rotary core-carrier, a reversible table or coreboardpivoted on an axis parallel to said carrier, said core-board havingopposite edges, which are of different distances from said axis, so thatthe surface of the layers of the core material may be formed on the coreat difierent diameters.

4. In an apparatus for forming pipe-cores, the combination of means forsupporting a core-carrier, a reversible core-board pivoted adjacent saidcore-carrier, said core-board havin edges at different diameters fromthe axis 0 said carrier when the core-board is reversed, and means forholding said board in horizontal position with either of its sidesuppermost.

5. In an apparatus for forming pipe-cores, the combination of twotransverse supports having core-axle bearings, a core-barrel supportedby said bearings, a reversible table or core-board also having bearingsin said support, and a weighted, notched arm pivoted in relation to saidsupports, and adapted to engage said table or core-board to hold thesame in position with either side uppermost;

6. In an apparatus for forming pipe-cores, thecombination of acore-carrier, transverse supports having bearings therein for the carrier axle transverselyadjustable bearings also carried by said supports,a reversible table or core-board pivoted to last-mentioned bearings, andmeans for moving said bearings transversely toward and from saidcore-axle bearings.

7. In an apparatus for forming pipe-cores, the combination of acore-barrel, a table or 'coreboard supported adjacent the same with anedge substantially parallel thereto, said edge comprising an adjustablestrip, and means intermediate the ends of said strip for bending thesame inward or outward.

8. In an apparatus for formin pipe-cores, the combination of acore-barre a table or core-board supported adjacent the same with anedgesubstantially parallel thereto, said edge comprising an adjustablestrip, and means at the central portion of said strip for bending thesame inward or outward.

9. In an apparatus for forming pipe-cores, the combination of acore-carrier, a reversible table or core-board supported adjacent thesame with its edges substantially parallel thereto, said edgescomprising adjustable strips, and adjusting-screws connecting said tableor core-board and said strips and 10- cated at the central portions ofthe latter, for

bending the same inward or outward.

In testimony whereof we have hereunto set our hands this 28th day ofJuly, 1904.

Witnesses:

JULIA Fv CLAYTON, G. O. WILLIS.

